Among the several schemes that have been reported to be a satisfactory alternative to Portland cement is alkali-activated cement, which has recently started to receive greater consideration in construction sectors. Conventional two-part alkali activation has many drawbacks, including that the activating solution is viscous, problematic and is not user friendly to handle. Thus, the aim of this research is to produce a one-part alkali-activated metakaolin/natural pozzolan, by using an earth alkaline source (rich in calcium oxide) from waste material (lime kiln dust), as an activating precursor to break the alumina-silicate crystalline phases. Thermal treatment of materials at two levels of treatment (450°C and 950°C) was used as an assisted activation approach. Analytical techniques, including X-ray powder diffraction, thermogravimetric analysis, Fourier transform infrared spectroscopy and scanning electron microscopy, were utilised to investigate the performance of the developed materials at a molecular level. Reduction of crystalline peaks, as well as the appearance of new wollastonite minerals within the calcined lime kiln dust, contributed to the development of 27 MPa compressive strength after 28 days. The dissolution that occurred through the pozzolanic reaction as well as thermal treatment evidently contributed to transform crystalline to amorphous phases.

中文翻译：

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使用石灰废料开发单组分碱活化偏高岭土/天然火山灰粘合剂

在已报道的几种可替代波特兰水泥的方案中，碱活化水泥最近开始在建筑行业受到更多考虑。传统的两部分碱活化有许多缺点，包括活化溶液是粘稠的、有问题的并且对用户来说操作不友好。因此，本研究的目的是通过使用来自废料（石灰窑尘）的碱土源（富含氧化钙）作为活化前体来破坏铝硅酸盐结晶相。在两个处理水平（450°C 和 950°C）下对材料进行热处理用作辅助激活方法。分析技术，包括 X 射线粉末衍射、热重分析、傅里叶变换红外光谱和扫描电子显微镜被用来在分子水平上研究所开发材料的性能。结晶峰的减少以及煅烧石灰窑粉尘中新硅灰石矿物的出现，有助于在 28 天后提高 27 MPa 的抗压强度。通过火山灰反应和热处理发生的溶解显然有助于将结晶相转变为非晶相。有助于在 28 天后提高 27 MPa 的抗压强度。通过火山灰反应和热处理发生的溶解显然有助于将结晶相转变为非晶相。有助于在 28 天后提高 27 MPa 的抗压强度。通过火山灰反应和热处理发生的溶解显然有助于将结晶相转变为非晶相。